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Engine cuts out with no warnign after an hour or so

Car: Audi, A4, 2002, 2.0 FSI     -    Back to Fix-It    -    Audi Repair Manuals

Q.My Audi A4 2.0 FSI LM03 YNG cuts out with no warnign after an hour or so running a constant journey. The EPC light comes on and she looses power. Leave her for a while and she will start up but same thing will happen again and again until cooled down.

Answer did u get a scan test of the engine computer and the codes ?
i need those to help

Addition Hi I will return with the codes shortly. Thanks for the reply.

Answer SURE JUST LET ME KNOW

Addition Hi, I got the codes from the RAC when they came out.
(1) P1504 -Intake system leak detected (CM$10)
(2) Warm up catalyst efficiency below threshold(bank1) Pending (CN$10)
He checked for air leakes everywhere and could not find one, cleared the codes down and then it went again the next day a couple of times on a long journey home.
If I change gear and take it to the max revs before changing again it then cuts and the CPE light comes on.;Leave it just coast for a minute and then the light goes off and I get power again.
Any suggestions would be welcome.
Thanks

Answer first check the breather valve on the valve cover remove the 4 screws and the 2 tubes take the small end and check if the check valve is closing when u suck and blow if not replace that valve first then clear code and then drive vehicle to see if the converter code comes back
please remember to press the green accept button for the information exchanged

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